had the oil changed in my rig a few days ago, it then proceeded to drip oil in the driveway the next few days. I figured they might have been a bit messy and maybe it was just where a little had gotten spilled? took it back in today, was there for about an hour, they decided it was the o-ring on the drainplug that was causing it. they replaced the o-ring and did another oil change for me at not cost.